<!DOCTYPE html>
<html lang="en">

<head>
  <meta charset="UTF-8">
  <meta http-equiv="X-UA-Compatible" content="IE=edge">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>3d-立方体</title>
  <style>
    * {
      margin: 0;
      padding: 0;
    }

    .box {
      width: 600px;
      height: 600px;
      margin: 0 auto;
      border: 5px solid gray;
      transform-style: preserve-3d;
      /* 做3D必加 */
      position: relative;
      transform: rotateY(30deg) rotateX(30deg);
      animation: run 5s linear infinite;
    }

    @keyframes run {
      0% {
        transform: rotateY(30deg) rotateX(30deg);
      }

      50% {
        transform: rotateY(300deg) rotateX(300deg);
      }

      100% {
        transform: rotateY(30deg) rotate(30deg);
      }
    }

    .box div {
      width: 200px;
      height: 200px;
      /* background: ; */
      position: absolute;
      left: 50%;
      top: 50%;
      margin-left: -100px;
      margin-top: -100px;
      line-height: 200px;
      text-align: center;
      font-size: 50px;
      color: white;
      opacity: 0.7;
    }

    .box div:nth-child(1) {
      background: gray;
      transform: translateZ(100px);
    }

    .box div:nth-child(2) {
      background: cadetblue;
      transform: translateX(-100px) rotateY(-90deg);
    }

    .box div:nth-child(3) {
      background: purple;
      transform: translateY(-100px) rotateX(90deg);
    }

    .box div:nth-child(4) {
      background: green;
      transform: translateY(100px) rotateX(-90deg);
    }

    .box div:nth-child(5) {
      background: red;
      transform: translateX(100px) rotateY(90deg);
    }

    .box div:nth-child(6) {
      background: darkblue;
      transform: translateZ(-100px) rotateY(360deg) rotateX(-180deg);
    }
  </style>
</head>

<body>
  <div class="box">
    <div>1</div>
    <div>2</div>
    <div>3</div>
    <div>4</div>
    <div>5</div>
    <div>6</div>
  </div>
</body>

</html>